How do I compair electric motors?  
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How do I compair electric motors? - 5/10/2008 1:12:44 PM   
BobMaine


 

Posts: 101
Joined: 8/8/2005
From: Midcoast , ME, USA
Status: offline 		One of the planes I am building has a list of motors (on a web page) that pilots have used on that model. They have numbers like 1234/56 or 20 - 20L or something similar. I know some of the numbers describe the physical size of the motor but how does one compare one motor to another quickly and easily? None of them had the name of the motor listed. I suppose you could Google each one and write down the rpms/volt, thrust, recommended prop size, etc. but that could take forever. Is there a chart somewhere that has list of the popular motors, their characteristics, etc.? There has to be an easier way...

_____________________________

I crewed on USAF cargo planes so long ago we worried about bird strikes from the rear...
       Post #: 1

RE: How do I compair electric motors? - 5/11/2008 5:38:25 AM   
jdetray


 

Posts: 1184
Joined: 12/7/2004
From: Napoleon, OH, USA
Status: offline 		Hi Bob -

Each motor manufacturer has its own naming convention, so the model numbers don't provide a useful comparison. One of the largest lists of motors I know about is The Great Electric Motor Test. Unfortunately, this covers only brand name motors and does not even attempt to cover the hundreds of low-cost Asian imports that are now available.

Perhaps someone knows of a better list.

- Jeff

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My other hobby: www.AstronomyBoy.com

(in reply to BobMaine)
       Post #: 2

RE: How do I compair electric motors? - 5/11/2008 11:56:09 AM   
BobMaine


 

Posts: 101
Joined: 8/8/2005
From: Midcoast , ME, USA
Status: offline 		Wow, that is quite a list. It does give one a better idea of motor specifications tho. Right now the "choose the right motor" system seems to be to ask someone for a recommendation and they usually say, "Well, I used this motor and prop on my XYZ and they are about the same size so it should work on yours." Or the manufacturer will recommend a motor and it is usually one they sell....

Thanks Jeff.

_____________________________

I crewed on USAF cargo planes so long ago we worried about bird strikes from the rear...

(in reply to jdetray)
       Post #: 3

RE: How do I compair electric motors? - 5/11/2008 6:40:24 PM   
jdetray


 

Posts: 1184
Joined: 12/7/2004
From: Napoleon, OH, USA
Status: offline 		If you know the specs of a motor recommended for your plane - such as kV, watts, maximum current, maxmum voltage, physical size, etc. - you can check the specs of other motors to find those that are a reasonable match. The factors you can't always match are quality and reliability, because these are often unknown with off-brand motors.

The "ask others" approach is often a good one. If your plane is a popular one, you'll get plenty of advice!

- Jeff

_____________________________

My other hobby: www.AstronomyBoy.com

(in reply to BobMaine)
       Post #: 4

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